... , digityal ph meter, digital ph monitor Product Features:Multi-point push-button calibration (up to 3 points) by using USA/NIST ph ... ,ManualDimensions: 210mm(L) 205mm(W) 65mm(H)Power: 9VDC, using AC adapters 110VAC/220VAC,60/ 50HzModel: PHS-3CWpH Range: 0.00 ... ,ManualDimensions: 210mm(L) 205mm(W) 65mm(H)Power: 9VDC, using AC adapters 110VAC/220VAC,60/ 50HzModel: PHS-3BWpH Range: 0.00 ...